Page 6 - Lesson note-6 Cyclic Quadrilateral Ch. 10 circle
P. 6

∠AEB =!80⁰-  (∠B+∠A)

                       Now lines AH and BF intersect

                       ∠FEH =∠AEB   (Vertically Opposite Angles)


                       ∠FEH=180⁰ -  (∠B+∠A)
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